Samsung’s Android Smartphones Released in 2010, see the Galaxy A Document
Samsung Electronics’ Android smartphone brand. It is a new brand that uses a full-metal material that reinforces the lineup of mid-range smartphones that are becoming increasingly important and inherits the design of the metal frame applied from Galaxy Alpha.
In the Galaxy A series, most of the sensors or functions are missing or slightly down-specified compared to the Galaxy S series. Depending on the model, Samsung Pay, wireless charging, OIS, waterproof dust, USB 3.0 support, and other software functions are missing, or the camera pixel number nerf, physical touch lighting is missing, and it has become a Galaxy J series. So it was controversial whether it was excessive cost reduction.For reference, Galaxy A, which came out a month before the launch of Galaxy S in 2010, has no relevance at all.
This series is derived from Galaxy Alpha, and uses an AP that supports 32-bit and 64-bit, and uses a full metal material as mentioned above. For this reason, the built-in battery was basically adopted as a Samsung smartphone at the time of release. In addition, it has specifications that seem to be aimed at smartphones from Chinese manufacturers, such as the use of a 5-megapixel camera on the front. And this background has been a basic element of Samsung Electronics smartphones since 2015.
In addition, in design, a part of design basics and materials between flagship smartphones corresponding to each generation and flagship smartphones of the next generation are applied in advance to perform an experimental role rather than a test bed for the next generation flagship smartphone. That’s why it has a premium-quality appearance, and its performance is at the lower level among flagships, so it has a clear position. Samsung has a pretty good design. So, the first generation of A5 is Galaxy Alpha and Galaxy Note 4, A5 2016 is Galaxy S6, A5 2017 is Galaxy S7, and Galaxy A8 2018  is very similar in appearance to Galaxy S9. The 2018 edition was named A8 and A8 + by unifying the numbers with the Galaxy S8. In the case of the A50 , the front and rear appearances changed compared to the S10, but the Note 10 and the rear became similar.
However, it is cheaper than premium smartphones, and it is one of the few smartphone brands in the Korean market that adequately meets the growing demand for mid-range smartphones since the handset distribution law. In particular, there are basic things such as camera performance, fingerprint recognition function, and 64GB memory.  In particular, the 2017 edition supports the same level of waterproof and dustproof as the flagship.
Some models support dual seams. Most hybrid dual-sims, the second SIM card tray serves as a micro SD card slot, so if you want to use a dual-sim, you can install the second SIM card into the second SIM card tray, and if you want to use a micro SD card, micro SD Simply insert the card into the second SIM card tray. However, the second SIM card and micro SD card cannot be installed at the same time, so either the second SIM card or the micro SD card can be used. A8 2018 can only use two SIM cards and a micro SD card at the same time.
In addition, since it is not a flagship smartphone brand, hardware cost reduction is being achieved. Typically, various sensors, such as gyroscope sensors, are not installed and are being released. However, in the 2017 edition, sensors that were deleted instead of OIS were released again. In addition, it supports IP68-rated waterproof dust! It remained until the Galaxy A 2018 edition and was excluded again after that.
In May 2018, the Galaxy A6 and Galaxy A6 + were released, but the lineup became ambiguous as products originally released in the Galaxy J5 lineup and Galaxy J7 lineup were released as the A series.  From this point on, it seems that he was preparing to integrate the Galaxy J series into the A series.
However, in the process of the Galaxy C series being virtually abolished and integrated into the Galaxy A series starting from the Galaxy A8 Star, existing global specifications such as MST module and waterproof dust are deleted, and Chinese manufacturers such as the multi-camera on the upper left side are competing for a radical specification competition. In fact, a counter-merger process is taking place, with conscious specifications applied, and is criticized outside China. The model that culminated in this change is the Galaxy A9 Pro.
In 2019, the Galaxy J series was merged into the A series, causing a cataclysm that increased the lineup to nine. J series, such as Galaxy J3 lineup and J6, to A10 , J5 lineup and A6 to A20, J7 lineup and A6 + to A30, A3 lineup to A40, A5 lineup  to A50, A6s to A60 , A7 lineup  succeeded to A70, A8 lineup  succeeded to A80, and A9 lineup succeeded to A90.
Samsung's Android Smartphones Released in 2010, see the Galaxy A Document - /10
Samsung Electronics' Android smartphone brand. It is a new brand that uses a full-metal material that reinforces the lineup of mid-range smartphones that are becoming increasingly important and inherits the design of the metal frame applied from Galaxy Alpha.